Steel article insensible to the action of hot gases, vapors, and liquids



i atented Sept. '6, 1932 NT OFFIC BENITO STRAUSS, OF ESSEN, GERMANY, ASSIGNOR T FRIED. KRUPP AKTIENGESELL- SCHAFT, 0F ESSEN-ON-TEE-RUHR, GERMANY Y ARTICLE INSEN SIBLE TO THE ACTION OF H0 GASES, VAPOBB, AND LIQUIDS Elo Drawing. Application filed January 7, 1980, Serial No. 419,218, and in Germany April 28, 1929.

The invention relates to the process for making steel insensible to the action of hot gases and vapors as set forth in my Patent, No. 1,829,118.

Exhaustive tests have proved that it is of great technical advantage to use for the manufaoture of steel articles that must have a high resistance to the action of hot gases, vapors and liquids, steel alloys which contain about 0.05 to 0.02 per cent of carbon, about to 12 per cent of chromium, 0.2 to l per cent of molybdenum, and preferably about 0.2't0 0.5 percent of vanadium, and

which then are treated according to the process set forth in my above-co-pending application.

vFOI', the articles manufactured from these steel alloys and treated in the above manner, viz. heated above the point of recalescence A03, quickly cooled from abovefthis point, and reheated up'to about 600 to 650 (3., are remarkable for the following advantages which are of great technical importance: They show a texture which is free of grain boundaries and further possess,

cence A03 and quickly cooled, followed by reheating to 600 to 650 0., said steel alloy containing 0.05 to 0.2% of carbon, about 5 to 12% chromium, about 0.2 to 1% of molybdenum and about 0.2 to 0.5% of vanadium. i

The foregoing specification signed at Gologne, Germany, this da of Dec., 1929.

s BENN STRAUSS.

probably due to this absence of grain boundaries, a very high resistance to the'attack of hydrogen even when taking place under high pressures and at high temperatures, and, finally, they possess a very high resistance to heat, more particularly when containing both molybdenum and vanadium.

What I claim is 1. Articles which in their normal use are subjected to the attack of hydrogen or of hydrogen containing gases taking place under high pressure and at high temperatures, said articles consisting of a steel alloy that has been heated above the point of recalescence A03 and quickly cooled, followed by reheating to 600 "to 650 0., said steel alloy containing 0.05 to 0.2% of carbon, about 5 to 12% of chromium and about 0.2 to 1% of molybdenum.

2. Articles which in their normal use are subjected to the attack of hydrogen or of. 

